mustn't 表禁止.首先要读懂句子的意思——当我们看到右边的标识时,我们不能大声说话.
标志里有的是Don`t speaking 之类的.
must和need不符合句意,needn't表没必要.
We talk loudly when we see the sign on the right
We talk loudly when we see the sign on the right
must mustn't need needn't
答案选mustn't ,谁可以帮解答
must mustn't need needn't
答案选mustn't ,谁可以帮解答
英语人气:731 ℃时间:2020-03-27 23:49:43
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